Organisation chart does not show anything or is wrong

The thing which usually makes the organisation chart behave oddly is if you have more than one employee with no manager set. The logic behind this is that in a hierarchy only the top of the pyramid should have no manager and, therefore, if there is more than one employee with no manager it cannot know which is the top of the pyramid.

If you only have one set with no manager, then ensure all employees have the correct managers assigned as this again can cause errors.